Transponder in a sentence as a noun

They did this on 9/11 when the transponder signals for three of the aircraft disappeared.

I would have guessed that it be impossible to turn off the transponder on a commercial grade aircraft.

Easy as, the pilots are required to turn the transponder off as soon as they land, so planes on the ground don't show up on radar.

With its transponder off, it is possible, though more difficult, to track an aircraft by its primary radar returns.

In the case of the radar transponder there is the very prosaic reason that ATC doesn't want their screen filled with all the aircraft sitting at gates.

Electrical fire starts, takes out ADS-B transponder, pilots unaware and continue the flight as normal\n2.

One big hole in this theory is that its been widely reported [1] that a transponder was switched off before the pilots last radio contact.

Damage from an electrical fire on board could possibly explain the first transponder going out, even if the crew wasn't aware of the fire yet.

This begs the question: why on earth is it even possible to turn off a transponder mid-flight on a commercial plane carrying hundreds of human beings?

>You just need to turn off your transponder, and you can fly wherever you want?Just from reading comments in the linked piece, it seems that is true for some parts of the world.

When a transponder works fine the vast majority of the time, and peacetime is the prevailing norm, there isn't a cost justification for it.

They radio a goodbye as they leave ATC, still unaware of anything which means that a fire has taken out a transponder and they are unaware of that fact\n3.

It will not be 'cancelled' by the transponder then being switched off, the operative would have to cancel it, which they wouldn't do until after contact had been reached.

But unlike transponder data, primary radar returns do not show the aircraft's identity and altitude.

This data is available regardless the pilot-entered 4 octal digit Mode A transponder code.

Controllers at centers rely so heavily on transponder signals that they usually do not display primary radar returns on their radar scopes.

"the maximum altitude transmitted by a U-2 transponder is FL600: even if the aircraft is flying well above it, the Dragon Lady’s mode C will show no higher than 60,000 feet.

Because just the guy turn off transponder?I think either we have been seriously mislead of what our technologies capabilities are or one of states of the area in knowing more than it said.

Those four planes, like all aircraft traveling above 10,000 feet, were required to emit a unique transponder signal while in flight.> On 9/11, the terrorists turned off the transponders on three of the four hijacked aircraft.

Three of the four aircraft hijacked as part of the 9/11 attacks had their transponders turned off:> Controllers track airliners such as the four aircraft hijacked on 9/11 primarily by watching the data from a signal emitted by each aircraft's transponder equipment.

Transponder definitions

noun

electrical device designed to receive a specific signal and automatically transmit a specific reply